Java Spring Boot Blockchain Spring web3j Ethereum
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web3j

Description

Spring Boot Starter for web3j

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web3j Spring Boot Starter

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Integrate web3j into your Spring Boot applications via Spring's dependency injection.

Getting started

A sample application is available here

To use, create a new Spring Boot Application, and include the following dependencies:

Maven:

    org.web3j
    web3j-spring-boot-starter
    4.0.3

Gradle:

compile ('org.web3j:web3j-spring-boot-starter:4.0.3')

Now Spring can inject web3j instances for you where ever you need them:

@Autowired
private Web3j web3j;

No additional configuration is required if you want to connect via HTTP to the default URL http://localhost:8545.

Otherwise simply add the address of the endpoint in your application properties:

# An infura endpoint
web3j.client-address = https://rinkeby.infura.io/

Or, an IPC endpoing

web3j.client-address = /path/to/file.ipc

Admin clients

If you wish to make use of the personal module methods that are common to both Parity and Geth
to manage accounts, enable the admin client:

web3j.admin-client = true

Then Spring can inject admin clients:

 @Autowired
 private Admin admin;

HTTP client configuration

Some Ethereum operations take longer than the default HTTP timeout set by the

OkHttp3
library used by
web3j
. To configure those timeouts set the web3j
httpTimeoutSeconds
property:
web3j.httpTimeoutSeconds = 600  

This sets all three OkHttp3 timeouts:

connect
,
read
, and
write
.

Valid values are any non-negative integer.

A value of '

0
' means: no timeout.

Note: This is not required for transacting with web3j.

Further information

For further information on web3j, please refer to the web3j home page.

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